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Finding the Fourth Proportional to 108.76, 150.12 and 85.48

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Solution

The fourth proportional to 108.76, 150.12 and 85.48 is: 117.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.76 : 150.12 = 85.48 : x
  2. Step 2: Convert to fraction form
    108.76/150.12 = 85.48/x
  3. Step 3: Cross multiply
    108.76x = 150.12 × 85.48
  4. Step 4: Simplify right side
    108.76x = 12,832.26
  5. Step 5: Solve for x
    x = 12,832.26/108.76
  6. Step 6: Final answer
    x = 117.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.